package com.itheima.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(urlPatterns = "/*")   // 拦截的路径
@Slf4j
public class MyFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();// /backend/index.html
        log.info("拦截到请求：{}", requestURI);
        //定义不需要过滤的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/**",
                "/common/**",
                "/upload.html",
                "/wx/notify"//此地址由微信服务器访问，必须直接放行
        };
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                filterChain.doFilter(request, response);
                return;
            }
        }
        //4、判断登录状态，如果已登录，则直接放行
        HttpSession session = request.getSession();
        Long employeeId = (Long) session.getAttribute("employee");
        Long userId = (Long) session.getAttribute("userId");
        if (employeeId != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("employee"));
            BaseContext.threadLocal.set(employeeId);
            filterChain.doFilter(request, response);
            return;
        }
        if (userId != null) {
            BaseContext.threadLocal.set(userId);
            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getOutputStream().write(JSON.toJSONString(R.error("NOTLOGIN")).getBytes());
        return;
    }
}
